Half-integer charge injection by a Josephson junction without excess noise

Autor:	Hassler, F., Grabsch, A., Pacholski, M. J., Oriekhov, D. O., Ovdat, O., Adagideli, I., Beenakker, C. W. J.
Rok vydání:	2020
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity
Zdroj:	Phys. Rev. B 102, 045431 (2020)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.102.045431
Popis:	A Josephson junction in a topological superconductor can inject a charge e/2 into a normal-metal contact, carried by chiral Majorana edge modes. Here we address the question whether this half-integer charge is a sharp observable, without quantum fluctuations. Because the Majorana modes are gapless, they support charge fluctuations in equilibrium at zero temperature. But we find that the excess noise introduced out of equilibrium by the e/2 charge transfer vanishes. We discuss a strategy to reduce the equilibrium fluctuations, by means of a heavy-tailed time-dependent detection efficiency, to achieve a nearly noiseless half-integer charge transfer. Comment: 11 pages, 4 figures; V2: added an appendix on the alternative calculation via bosonisation
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2005.08655 Zobrazit plný text záznamu View this record from Arxiv